icnss2: Register for mpss subsys rather than modem subsys
From 5.10 kernel onwards, remoteproc team has renamed
modem subsystem to mpss subsystem. So, icnss driver
should register for mpss subsystem rather than modem
subsystem.
Change-Id: I68276c7b03a4819ba0e219f1019a73eafa3ac456
Signed-off-by: Sandeep Singh <[email protected]>